Cam limiting internal fixed spiral clutch device for lifting opening and closing of grab ship unloader

Abstract

The invention provides a cam limiting internal fixing spiral clutch device for lifting opening and closing of a grab ship unloader, which relates to the technical field of bulk cargo wharf grab ship unloaders and comprises a pinion in clearance fit with a planetary reducer shaft, a cam limiting switch in bolted connection with a bull gear and an adjusting bolt. An end shaft hole of the pinion is provided with internal threads, a threaded hole is formed in the center of a planetary reducer shaft, and the adjusting bolt is matched with the threaded hole; the small gear is driven to slide in the axial direction to be engaged with or disengaged from the large gear by rotating the bolt cap. When the steel wire rope is replaced, the disengagement gear can avoid contact deviation caused by rotation of the cam limit switch shaft; the gear is directly meshed after the rope is replaced, and secondary contact adjustment is not needed. The structure of the device adopts a pure mechanical mode, operation is simplified, stability is high, and debugging time of about one day is saved for single maintenance.

Description

Technical Field

[0001] This invention relates to the field of grab unloader technology for bulk cargo terminals, and more particularly to a lifting and closing cam limit internal fixed screw clutch device for a grab unloader. Background Technology

[0002] As a core loading and unloading equipment at bulk cargo terminals, the grab unloader's operation relies on a four-drum mechanism driving a wire rope to move the grab bucket to grab and unload materials. During operation, the cam limit switch achieves precise control of the grab bucket's stroke by triggering deceleration, stop, and emergency stop contacts at their upper and lower limit positions. However, when the wire rope needs periodic replacement due to wear, traditional operation requires a single-sided motor to drive a planetary reducer to achieve single-movement of the drum. In this process, the planetary reducer shaft connected to the limit switch rotates synchronously with the drum, causing a slight deflection of the cam limit switch shaft. Because mechanical cam limit switches are extremely sensitive to angular deviations, even a small angle of rotation can cause contact position deviations, leading to the failure of the limit function.

[0003] In existing technology, after the wire rope is replaced, the cam limit switch needs to be manually removed and reinstalled, and the contact position needs to be calibrated with electrical debugging, which takes about one day and requires the cooperation of multiple technicians.

[0004] Therefore, existing technologies suffer from drawbacks such as cumbersome operation, long debugging cycle, and high labor costs in wire rope replacement scenarios. There is an urgent need for an innovative device with a simple mechanical structure, no electrical intervention required, and guaranteed to keep the limit switch shaft fixed, so as to achieve seamless connection of the limit function after rope replacement. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a fixed helical clutch device with an inner limit switch for the lifting and closing cam of a grab bucket unloader. This invention controls the small gear to slide and engage or disengage from the large gear along the planetary reducer shaft by adjusting bolts, thus fixing the cam limit switch shaft and preventing contact point deviation during rope changes.

[0006] To achieve the above objectives, the present invention provides a lifting and closing cam limit internal fixed helical clutch device for a grab unloader, comprising a planetary reducer shaft, a gear set, a mounting bracket, a cam limit switch, a bolt cap, and an adjusting bolt; The gear set includes a large gear and a small gear. The small gear is connected to the planetary reducer shaft with a clearance fit. The large gear is fixedly connected to the cam limit switch by a bolt set. The cam limit switch is connected to the mounting bracket via a bolt assembly; The pinion has an internal thread at its end, the bolt cap has an external thread, the bolt cap is connected to the pinion by a threaded engagement, the planetary reducer shaft has a threaded hole at its center, and the adjusting bolt engages with the threaded hole; The adjusting bolt drives the pinion to slide axially along the planetary reducer shaft by rotation, thereby enabling the pinion to mesh with or disengage from the large gear.

[0007] Furthermore, the end of the adjusting bolt is provided with a retaining plate, which contacts the end face of the pinion. By rotating the adjusting bolt, the pinion is driven to move axially.

[0008] Furthermore, the large gear and the cam limit switch are fixedly connected by a bolt group, which includes multiple evenly distributed bolts. The bolts pass through the corresponding screw holes of the cam limit switch and are threadedly connected to the mounting bracket.

[0009] Furthermore, the mounting bracket has an L-shaped structure, with one end connected to the cam limit switch by bolts, and the other end fixedly connected to the planetary reducer housing of the grab bucket unloader by bolts.

[0010] Furthermore, the reverse rotation of the adjusting bolt drives the pinion to slide outward along the axis of the planetary reducer, so that the pinion is completely disengaged from the large gear, thereby preventing the cam limit switch shaft from rotating during single-action rope changing of the drum.

[0011] Furthermore, the forward rotation of the adjusting bolt drives the pinion to slide along the inner side of the planetary reducer axis, so that the pinion and the large gear are fully engaged, thereby restoring the connection between the cam limit switch and the planetary reducer shaft.

[0012] The present invention also provides a four-drum mechanism for a grab unloader, including the above-mentioned lifting and closing cam limit inner fixed helical clutch device for the grab unloader.

[0013] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. The present invention provides a lifting and closing cam limit internal fixed spiral clutch device for a grab bucket unloader. The device achieves gear engagement and disengagement through a mechanical structure, eliminating the need for manual removal and readjustment of the cam limit switch. This saves manual adjustment time during a single rope change operation and reduces the need for collaborative work between electrical and mechanical personnel.

[0014] 2. The grab unloader lifting opening and closing cam limit inner fixed screw clutch device provided by the present invention adopts a pure mechanical design of gear transmission and thread adjustment. It has few parts and no complicated electrical control, which reduces the failure rate. At the same time, it is suitable for the harsh working conditions of high load and high corrosion in ports.

[0015] 3. The present invention provides a lifting and closing cam limit internal fixed screw clutch device for a grab bucket unloader. By fixing the rotation state of the cam limit switch shaft, it ensures that the contact position remains unchanged during rope changing, eliminates the risk of limit function failure caused by small-angle rotation, and improves the safety and stability of equipment operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the lifting and closing cam limiting internal fixed spiral clutch device of the grab unloader according to the present invention. Figure 2 This is an enlarged schematic diagram of the structure at point A of the lifting and closing cam limiting inner fixed spiral clutch device of the grab bucket unloader described in this invention; Figure 3 This is a schematic diagram of the adjusting bolt baffle of the lifting and closing cam limit fixing screw clutch device of the grab bucket unloader according to the present invention; Figure 4 This is a schematic diagram of the bolt cap shoulder of the lifting and closing cam limit fixing spiral clutch device of the grab bucket unloader according to the present invention; Figure 5 This is a schematic diagram of the disengagement of the large gear and small gear of the lifting and closing cam limiting internal fixed spiral clutch device of the grab unloader described in this invention. Figure 6 This is a schematic diagram of a four-drum mechanism applied to a grab bucket unloader according to the present invention.

[0018] In the diagram: 1. Planetary reducer shaft; 2. Large gear; 3. Mounting bracket; 4. Cam limit switch; 5. Small gear; 6. Bolt cap; 7. Adjusting bolt; 8. Stop plate; 9. Bolt cap shoulder. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0026] like Figures 1 to 6 As shown, the present invention provides a lifting and closing cam limit internal fixed helical clutch device for a grab unloader, comprising: a planetary reducer shaft 1, a gear set, a mounting bracket 3, a cam limit switch 4, a bolt cap 6, and an adjusting bolt 7; The gear set includes a large gear 2 and a small gear 5. The small gear 5 is connected to the planetary reducer shaft 1 with a clearance fit. The large gear 2 is fixedly connected to the cam limit switch 4 by a bolt group. The contact surfaces of the large gear 2 and the small gear 5 are coated with lubricating oil to reduce friction. The cam limit switch 4 is connected to the mounting bracket 3 by a bolt group, which includes multiple evenly distributed bolts. The bolts pass through the corresponding screw holes of the large gear 2 and the cam limit switch 4 in sequence and are threadedly connected to the mounting bracket 3. The pinion 5 has an internal thread at its end, the bolt cap 6 has an external thread, the bolt cap 6 and the pinion 5 are connected by a threaded engagement, the planetary reducer shaft 1 has a threaded hole at its center, and the adjusting bolt 7 engages with the threaded hole; The adjusting bolt 7 drives the small gear 5 to slide axially along the planetary reducer shaft 1 by rotation, thereby enabling the small gear 5 to mesh or disengage from the large gear 2. Through clearance fit and threaded drive structure, the gear set can be flexibly engaged and disengaged, ensuring that the cam limit switch 4 shaft does not rotate when changing ropes, avoiding contact misalignment. Moreover, the structure is simple, requires no additional debugging, and can be directly restored after changing ropes, saving manpower and time costs.

[0027] Furthermore, the end of the adjusting bolt 7 is provided with a retaining plate 8, which contacts the end face of the pinion 5. By rotating the adjusting bolt 7, the pinion 5 is driven to move axially. When the adjusting bolt 7 is rotated in the reverse direction, the retaining plate 8 pushes the pinion 5 to slide outward along the planetary reducer shaft 1, causing the pinion 5 to disengage from the large gear 2. When the adjusting bolt 7 is rotated in the forward direction, the retaining plate 8 pulls the pinion 5 to slide inward along the planetary reducer shaft 1, causing the pinion 5 to mesh with the large gear 2. The retaining plate 8 acts directly on the end face of the pinion 5 to ensure stable transmission of rotational torque and avoid deviation or jamming during sliding. Through the rigid contact of the retaining plate 8, the accuracy of gear meshing / disengagement is improved, and operational errors are reduced.

[0028] Furthermore, the large gear 2 and the cam limit switch 4 are fixedly connected by a bolt group, which includes multiple evenly distributed bolts. The bolts pass through the corresponding screw holes of the cam limit switch 4 and are threadedly connected to the mounting bracket 3. The even distribution of the bolt group ensures that the large gear 2 and the cam limit switch 4 are axially aligned, avoiding deflection caused by uneven force. The multi-point fixing of the bolt group enhances the overall stability of the large gear 2 and the cam limit switch 4, preventing the connection from loosening due to vibration or external force during rope changing.

[0029] Furthermore, the mounting bracket 3 has an L-shaped structure. One end is connected to the cam limit switch 4 by bolts, and the other end is fixedly connected to the planetary reducer housing of the grab bucket unloader by bolts. The L-shaped structure design makes the cam limit switch 4 and the mechanical frame form a rigid support, limiting the rotation and shaking of the cam limit switch 4 shaft.

[0030] Furthermore, the reverse rotation of the adjusting bolt 7 drives the pinion 5 to slide outward along the planetary reducer shaft 1. The bolt cap shoulder 9 will bear the force of the adjusting bolt 7 retainer 8, so that the pinion 5 is completely disengaged from the large gear 2. This ensures that the cam limit switch 4 shaft does not rotate during single-action rope changing of the drum. After disengagement, the rotation of the planetary reducer shaft 1 is no longer transmitted to the cam limit switch 4 shaft, thus realizing single-action rope changing of the drum. During the rope changing process, the cam limit switch 4 shaft remains stationary to avoid changes in the contact position.

[0031] Furthermore, the forward rotation of the adjusting bolt 7 drives the pinion 5 to slide inward along the planetary reducer shaft 1, so that the pinion 5 and the large gear 2 are fully engaged, thereby restoring the connection between the cam limit switch 4 and the planetary reducer shaft 1. After changing the rope, there is no need to readjust the cam limit switch 4, and it can be put into operation directly.

[0032] like Figure 6 As shown, the present invention also provides a four-drum mechanism for a grab unloader, including the above-mentioned lifting and closing cam limit fixed spiral clutch device for the grab unloader.

[0033] Detailed implementation process of this device: Before changing the rope, rotate the adjusting bolt. The retaining plate 8 of the adjusting bolt 7 pushes the small gear 5 to slide outward along the axis until the small gear 5 is completely disengaged from the large gear 2, disconnecting the mechanical connection between the planetary reducer shaft 1 and the cam limit switch 4. At this time, the cam limit switch 4 remains stationary due to the rigid fixation of the L-shaped mounting bracket 3, avoiding contact confusion, and allowing for safe single-action rope changing on the drum. After the rope is changed, rotate the adjusting bolt 7 in the opposite direction. The baffle 8 pulls the small gear 5 to slide along the inner side of the axis and mesh with the large gear 2, restoring the transmission path between the planetary reducer shaft 1 and the cam limit switch 4.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lifting and closing cam limiting inner fixed helical clutch device for a grab bucket ship unloader, characterized in that, include: Planetary reducer shaft, gear set, mounting bracket, cam limit switch, bolt cap, adjusting bolt; The gear set includes a large gear and a small gear. The small gear is connected to the planetary reducer shaft with a clearance fit. The large gear is fixedly connected to the cam limit switch by a bolt set. The cam limit switch is connected to the mounting bracket via a bolt assembly; The pinion has an internal thread at its end, the bolt cap has an external thread, the bolt cap is connected to the pinion by a threaded engagement, the planetary reducer shaft has a threaded hole at its center, and the adjusting bolt engages with the threaded hole. The adjusting bolt drives the pinion to slide axially along the planetary reducer shaft by rotation, thereby enabling the pinion to mesh with or disengage from the large gear.

2. The grab bucket unloader lifting and closing cam limiting inner fixed screw clutch device according to claim 1, characterized in that, The end of the adjusting bolt is provided with a retaining plate, which contacts the end face of the pinion. By rotating the adjusting bolt, the pinion is driven to move axially.

3. The grab bucket unloader lifting and closing cam limiting inner fixed screw clutch device according to claim 1, characterized in that, The large gear and the cam limit switch are fixedly connected by a bolt group, which includes multiple evenly distributed bolts. The bolts pass through the corresponding screw holes of the cam limit switch and are threadedly connected to the mounting bracket.

4. The grab bucket unloader lifting and closing cam limiting inner fixed screw clutch device according to claim 1, characterized in that, The mounting bracket has an L-shaped structure, with one end connected to the cam limit switch by bolts and the other end fixedly connected to the planetary reducer housing of the grab bucket unloader by bolts.

5. The grab bucket unloader lifting and closing cam limiting inner fixed screw clutch device according to claim 1, characterized in that, The reverse rotation of the adjusting bolt drives the small gear to slide along the outer side of the planetary reducer axis, so that the small gear is completely disengaged from the large gear, so that the cam limit switch shaft does not rotate when the drum is changing rope in a single action.

6. The grab bucket unloader lifting and closing cam limiting inner fixed screw clutch device according to claim 1, characterized in that, The forward rotation of the adjusting bolt drives the pinion to slide along the inner side of the planetary reducer axis, so that the pinion and the large gear are fully engaged, thereby restoring the connection between the cam limit switch and the planetary reducer shaft.

7. A four-drum mechanism applied to a grab bucket unloader, characterized in that, Includes the grab bucket unloader lifting opening and closing cam limit internal fixed helical clutch device as described in any one of claims 1 to 6.

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